Karan Johar posted on Twitter a video of 1962 animated science fiction TV show Fireball XL5, which followed the missions of spaceship Fireball XL5, commanded by Colonel Steve Zodiac of the World Space Patrol.

Hrithik replied on Karan's Tweet.

“@karanjohar let’s go to space in your next! ‘K3G’ part two. Family mission to resolve alien family dramas on other planets,” Hrithik tweeted on Wednesday.Currently he is busy in shooting of Ashutosh Gowarikar's period drama 'Mohenjo daro'.